Mongolia's mining boom raises environment concerns

The government has already repealed over 200 exploration and exploitation licenses from mining companies operating within 200 meters of forest and water sources, binding them to another legal tenant: they have two years to rehabilitate the areas, under the observance of local government and citizens.

Companies granted licenses must deposit a "rehabilitation bond" -- or 50 percent of the estimated costs to restore an ecological zone – into a designated bank account to be managed by the local government before beginning any mining activity. 
http://www.dw.de/mongolias-mining-boom-raises-environment-concerns/a-17534285